Luther on the New Man

[GHansen]

“And that ye be renewed in the spirit of your mind, and put on the new man, that after God hath been created in righteousness and holiness of truth” (Ephesians 4:23,24). 

17. The true Christian, Paul asserts, has been molded through faith in Christ into a new man, like unto God, truly justified and holy in his sight; even as Adam originally was in perfect harmony of heart with God, showing true, straightforward confidence, love and willingness. And his body was holy and pure, knowing naught of evil, impure or improper desire. Thus the whole life of the man was a beautiful portrait of God, a mirror wherein God himself was reflected; even as the lives and natures of the holy spirits the angels are wrapped up in God and represent true knowledge of him, assurance, and joy in him and utterly pure and holy thoughts and works according to the will of God.

18. But since man is now so grievously fallen from this cheerful confidence, this certainty and joy, into doubts or into presumption toward God, and from unspotted, noble obedience into the lusts of iniquity and ungodliness, it follows that not from mankind can come help or relief. Nor can any one hope for remedy except the Christians, who through faith in Christ begin again to have a joyful and confident heart toward God. They thus enter again into their former relation and into the true paradise of perfect harmony with God and of justification; they are comforted by his grace. Accordingly they are disposed to lead a godly life in harmony with God’s commandments and to resist ungodly lusts and ways. These begin to taste God’s goodness and loving kindness, as Paul says, and realize what they lost in paradise. He, therefore, that would be a Christian should strive to be found in this new man created after God; not in blind error and vain conceit, but in the very essence of righteousness and holiness before God.

Sermons  of Martin Luther, volume 8, p. 261.  Trans. J.N. Lenker, p.261